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Title: Quantum jumps in the magnetization of a magnet with antiferromagnetic impurities
Authors: Lagutin, AS
Semeno, Alexei
Vanacken, Johan
Bruynseraede, Yvan #
Issue Date: Nov-2001
Publisher: American physical soc
Series Title: Physical review b vol:64 issue:18 article number:184415
Abstract: The differential magnetic susceptibility of GdxY3-xFe5O12 (0.01 < x < 0.2) polycrystalline compounds is studied in the temperature range 0.6 to 4.2 K and in pulsed magnetic fields up to 50 T. The magnetization of the compound with the lowest Gd content (x = 0.01) shows instead of a classical, a quantum (stepwise) phase transition to a completely saturated ferromagnetic phase at T = 0.6 K, in magnetic fields around 33 T. To explain these results, a Heisenberg ferrimagnetic model with weakly coupled antiferromagnetic impurities is used. Following this model, the nonequidistance of the energy levels of the impurity ions causes the occurrence of susceptibility oscillations under a variation of external magnetic fields.
ISSN: 0163-1829
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
# (joint) last author

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